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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bb3ba117a3207abe34b6b54001cc039d38784a842045a09506a4df329ad6f7b' 
  AND token = '9ElFr+K5WSwo47vWxZxVvDlC1Ndjtl80bHoNOuhK9SQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}